This afternoon I went to start my car up before work to let it warm up and defrost the windows, mind you it snowed last night. So I start to drive and I noticed that my temp. gauge was climbing, I was puzzled why because I haven't had a problem with it since summer, another problem was that I was getting no heat at all it was just blowing cold air. So I pull off into a gas station so I could pop the hood and see if maybe there was a leak. Everything looked fine, although there was a tiny leak from a clamp so I just tightened the clamp and that leak stopped. I was still puzzled because like I said, there were no other leaks, and I had no idea why I wasn't getting heat since the engine was running so hot. As I was at the gas station a guy came up and asked what the problem was and he said it was probably the thermostat. I didn't think it was because it has never given me a problem before and it has been cold lately. So I got it back home as quickly as possible and the temp. was still high but the car was running perfect no hesitation or anything.

When I got home from work (sister drove me while the car sat) my car was gone Turns out my brother took it to the bank since his Z was covered in snow and couldn't get it out of the driveway. I asked him if the car was running like ****, no heat, etc. He had no problems with it, I started the car and sure enough there was plenty of heat and the temp was stable. The only thing I noticed was there was a low coolant light, not a big problem probably just from that little leak.

So I my question is, what caused that overheating and no heat problem? Was that guy right when he said it was the thermostat?

 

Probably.

 

would an air pocket make it read hot?

 

What would explain the no heat? And I never had any problem with cooling system since the summer.